1. The formation of vegetable mould through the action of worms with observations on their habits;Darwin,1881
2. Conversion of sludges into “topsoils” by earthworms;Mitchell;Compost Sci.,1977
3. Vermicomposting of combined sewage sludge and municipal refuse;Grapelli,1983
4. Humus production from farmyard wastes by vermicomposting;Nardi,1983
5. Osservazioni preliminari sul ruolo di Eisenia foetida nell'umificazione del letame;Riffaldi;Agrochimica,1983